Yes, the carbon from the printer melted into the case. Ugly, amateur hour.
But that's not the worst of it. I have big ear canals, use the ETY ER20 Large size. These "Earpads," at twice the price, seem no better. By themselves they do not fit my ears--NOT universal, no matter how jammed in. And they are not a flat "volume control for your ears" as advertised--per the measurements that come with the plugs and should have been on Massdrop.
Bass gets through (7.7 db mean attenuation at 63 Hz), But treble--which you need for singing, articulation, speech--(12.3 db at 500 Hz, 14.8 at 1000 Hz)--does NOT. It is NOT FLAT, not a "volume control for your ears." Since my ear canals are large, I have switched from the (only) included plugs to the larger flanges that came in one of my Shure IEM fit kits. But I don't expect enough improvement to justify the premium price over the ETY ER20 you can buy on Amazon.
This was my first Massdrop purchase. I hope everything on here is not some "audiophile" scam like these.